final project crossword puzzle

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Across
  1. 2. what is the most massive thing in our solar system
  2. 6. what two gasses make up most of nebulas
  3. 8. when was the solar nebula theory first thought of?
Down
  1. 1. This theory explains the varied composition of planets in the solar system and how solar winds forced lighter elements into the outer solar system, leaving the denser metals closer to the sun. the correct order of core accretion for planetesimals are
  2. 3. This is the theory that explains how some scientists think the solar system was created. It states that the solar system came from a massive cloud of gas and dust.
  3. 4. This theory explains how dense regions within a gas cloud can collapse under their own planetary systems
  4. 5. who made the solar nebula theory
  5. 7. what is the most accepted theory on how the solar system was formed